Re: [PATCH] drm/ttm: provide default page protection for UML

[Anton Ivanov]

On 02/09/2021 08:43, Johannes Berg wrote:
> On Thu, 2021-09-02 at 07:19 +0100, Anton Ivanov wrote:
> > > > I have a question though - why all of DRM is not !UML in config. Not
> > > > like we can use them.
> > >
> > > I have no idea about that.
> > > Hopefully one of the (other) UML maintainers can answer you.
> >
> > Touche.
> >
> > We will discuss that and possibly push a patch to !UML that part of the
> > tree. IMHO it is not applicable.
>
> As I just said on the other patch, all of this is fallout from my commit
> 68f5d3f3b654 ("um: add PCI over virtio emulation driver") which is the
> first time that you could have PCI on UML.
>
> Without having checked, in this particular case it's probably something
> like
>
> 	depends on PCI && X86_64
>
> as we've seen in other drivers (idxd, ioat).
>
> The biggest problem is probably that UML internally uses X86_64
> (arch/x86/um/Kconfig), which is ... unexpected ... since CONFIG_X86_64
> is typically considered the ARCH, and now the ARCH is actually um.
>
> I think we can just fix that and get rid of this entire class of
> problems? Something like
>
> https://p.sipsolutions.net/fbac19d86637e286.txt

Good idea. I suspect that DRM will not be the only thing to pop up out 
of this so we might as well fix it "at the top".

A

> johannes
>
>
>
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Anton R. Ivanov
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